corresponds to a one-hidden-layer FCNN (Figure REF ). Each unit of the network is denoted by \(G_\alpha = v_{1,\alpha }^{i_1} v_{2, \alpha }^{i_2} \ldots v_{d,\alpha }^{i_d}\) , where \(v_{i,\alpha } \in \mathbb {R}^{n_i}\) . The Hierarchical Tucker (HT) decomposition [1]} corresponds to an CNN structure (Figure REF ).
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